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981.
在分析含油污水中的悬浮固体含量时,因为现场注入系统是密闭系统,在不去除曝氧因素的情况下,采用SY/T 5329-94《碎屑岩油藏注水水质推荐指标及分析方法》不能准确反映出悬浮固体含量的真实数据。提出了添加铁离子稳定剂的建议,针对加热方式和滤膜的选择,根据实验数据给出了合理的解释与做法,使悬浮固体含量的测定更加符合现场实际,从而使测试数据对于污水处理系统和注入系统更加具有指导意义。 相似文献
982.
Juan Benjamin Duarte Duarte Leonardo Hernán Talero Sarmiento Katherine Julieth Sierra Suárez 《Contaduría y Administración》2017,62(4):1345-1360
The main objective in this paper is developing a cellular automaton model where interact more than one kind of broker, where the use and exchange of information between the investors explain the complexity through the Hurst coefficient estimation, this, represents an efficient or random market when the value is equal to 0.5. Due to the variants proposed in this research it can be determined that should exist a rational component in the simulator in order to generate an efficient behavior. 相似文献
983.
实际利率和实际利率法在会计、财务中应用广泛,在企业会计准则中多处涉及,掌握实际利率法是财会人员所必须掌握的一项技能。本文针对目前主要依靠手工操作、计算复杂、结果未必准确的弊端,探讨利用Excel函数对实际利率自动求解并利用电子表格对实际利率法所涉及的其它计算结果自动生成问题,从而提高工作效率和准确性。 相似文献
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985.
On-farm experiments to study soil fertility depletion—one of the biophysical factors limiting crop production—were conducted in six villages of central Myanmar during 1997 to 1999. Systematic socioeconomic surveys and analysis of socioeconomic and crop production factors aided the selection of farmers. Topsoil mineral nitrogen content at the start of the cropping season was high (10–25 mg N kg?1). Available phosphorous was around the threshold level for most crops, but exchangeable potassium was low. The predominant continuous cropping system of sole groundnut was on average positive for P (0.24 kg ha?1 y?1) and K (7.05 kg ha?1 y?1) and negative for N (?32.4 kg ha?1 y?1). A negative balance for N in the groundnut/pigeonpea (?58 kg ha?1 y?1) and mung bean/pigeonpea (?56 kg ha?1 y?1) intercropping systems was noted. The nutrient balances were positive in early sesame—late sesame (29 kg N ha?1 y?1, 8 kg P ha?1 y?1, 33 kg K ha?1 y?1) and early sesame/pigeonpea (8 kg N ha?1 y?1, 15 kg P h?1 y?1, 44 kg K ha?1 y?1) production systems while sole sorghum system resulted in positive balance for N (23.8 kg ha?1 y?1) and negative balance for K (?3.8 kg ha?1 y?1). 相似文献
986.
养猪农户采用安全兽药行为的意愿分析——以四川为例 总被引:5,自引:0,他引:5
药物残留是影响猪肉质量的主要因素之一。本文利用实证研究方法,以四川省316个养猪农户(以下简称养猪户)的调查数据为依据,对养猪户生猪饲养过程中安全兽药采用的意愿进行了计量分析。通过研究表明,养猪户在使用兽药时,主要是以兽医提供兽药为主体,养猪户对兽药效果的认知程度很低。通过Logistic模型得出:养猪户的性别、年龄、养猪年数、养猪方面的产业化组织是否提供服务、养猪户是否了解兽药残留对人体的危害、养猪户是否了解安全兽药的效果以及在使用兽药过程中是否得到政府的支持对养猪户采用安全兽药意愿有很大影响。 相似文献
987.
Abstract The ease of restrictions on foreign direct investment in China since 1990 has attracted a continuous and dramatic flow of outward investment from Taiwan to the mainland. At the same time, the relative wages for skilled workers in Taiwan have risen mildly despite a rapid increase in the share of educated workers in its labor market. The aim of this paper is to explore the linkage between capital outflows to China and the wage share of skilled workers in Taiwan over the period 1991 – 2001. We find that the pattern of changes in relative wages is consistent with shifts in the relative demand for skilled labor. For the most part, the increases in the relative demand for skilled workers could be attributable to within-industry factors. Findings also indicate that outward direct investment to China has a significantly positive impact on the skilled labor wage share. 相似文献
988.
989.
990.
World Heritage Sites are designated following evaluations of their universal values. However, their use is often shared by different user groups who may attach different meanings to the same heritage, leading to different interpretations and uses. This situation raises important questions for visitor management at World Heritage Sites, where a variety of users must be accommodated. Using Temple of Heaven as an example, the motivations, preferences and experiences are explored for three major user groups: residents, domestic and international tourists. Results show that residents and tourists exhibit different spatial and temporal patterns of use. Most local users are elderly and use the place regularly for exercise and social purposes. The historical and cultural values are widely recognized but tourists are motivated more strongly than local users to experience heritage values. Practical implications are generated to inform managers of the study site and other heritage sites shared by locals and tourists. 相似文献